He wrote: "Based on the fact that the ships and sailors have not been returned to Ukraine from Russia, I have decided it would be best for all parties concerned to cancel my previously scheduled meeting in Argentina with President Vladimir Putin.

"I look forward to a meaningful Summit again as soon as this situation is resolved."

The shock news comes just hours after a Russian official said the two leaders would meet to discuss ways to break diplomatic deadlocks over Syria, Iran and North Korea.

However, the Kremlin insider did not mention Russia's latest clash with the Ukraine which has put the Crimea on a war footing.

HOUSE OF HORRORS

'devastating injuries'

two detained

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'really frightening'

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SCHUMI’S ROCK

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But, the INF treaty didn’t cover sea-launched missiles.

Kremlin spokesman Dmitry Peskov told Dozhd TV earlier this month: “'The fact that America has become unpredictable lately is no secret to anyone.

“Such unpredictability from the largest country, the most powerful economy in the world, is the subject of deep global concern.”

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